Genetic Architecture of Conspicuous Red Ornaments in Female Threespine Stickleback.
Genetic Architecture of Conspicuous Red Ornaments in Female Threespine Stickleback.
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DOI：
10.1534/g3.115.024505
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发表时间：
2015-12-29
期刊：
影响因子：
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通讯作者：
McKinnon JS
中科院分区：
文献类型：
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作者：
Yong L;Peichel CL;McKinnon JS
解释为什么雌性动物身上会有明显的装饰物，这些装饰物具有雄性动物的典型特征，这一直是进化生物学中的一个长期挑战。这种女性装饰物被认为是通过适应性和非适应性的进化过程进化的。确定女性装饰物的遗传基础对于阐明这些女性特征在自然种群中出现和持续的机制非常重要，但关于其遗传基础的详细信息仍然很少。在这项研究中，我们调查了两个装饰品，橙红色的喉咙和骨盆刺，在三刺鱼（Gasterosteus aculeatus）的遗传结构。喉着色是男性特有的祖先海洋种群，但在一些衍生的流种群的女性，而骨盆棘着色的性二型是可变的人群。我们发现装饰品在两性之间有着共同的遗传结构。至少有三个独立的基因组区域有助于红喉着色，并藏有与色素产生和色素细胞分化相关的候选基因。这些地区之一也与脊柱着色，这表明这两个装饰品可能介导部分通过多效性遗传机制。
Explaining the presence of conspicuous female ornaments that take the form of male-typical traits has been a longstanding challenge in evolutionary biology. Such female ornaments have been proposed to evolve via both adaptive and nonadaptive evolutionary processes. Determining the genetic underpinnings of female ornaments is important for elucidating the mechanisms by which such female traits arise and persist in natural populations, but detailed information about their genetic basis is still scarce. In this study, we investigated the genetic architecture of two ornaments, the orange-red throat and pelvic spine, in the threespine stickleback (Gasterosteus aculeatus). Throat coloration is male-specific in ancestral marine populations but has evolved in females in some derived stream populations, whereas sexual dimorphism in pelvic spine coloration is variable among populations. We find that ornaments share a common genetic architecture between the sexes. At least three independent genomic regions contribute to red throat coloration, and harbor candidate genes related to pigment production and pigment cell differentiation. One of these regions is also associated with spine coloration, indicating that both ornaments might be mediated partly via pleiotropic genetic mechanisms.